That’s means if your internet is down for 2 months your dosing time will be out by about 1 minute.
If my internet was down for 2 months it would probably mean that we were in the beginning of a nuclear winter and those fish would have ended-up on the dinner plate long ago

In reality, I guess your biggest issue is your NodeMCU rebooting in this situation, so some sort of UPS would probably be a good idea.